Andzei, you are really close but it seems that you just need more air. If I remember right you don't ride behind a wakeboard boat and the small wake may be the problem. So unless you can get the wake bigger or ride with a longer rope to get more time you may keep crashing.
andzei, i can't do 7s, but it seems to me you could wait just a bit longer. it looks like you're killing some of your height by initiating the spin too early. if you could wait until you've entirely left the wake i think that would give you just that extra you need, because you're not far from it.